Double-stroke working head



July 3, 1928. 1,676,163

H. SCHLACHTER I DOUBLE STROKE WORKING HEAD Filed May 18, 1926 5Sheets-Sheet 1 July 3, 1928. 1,676,163 H. SCHLACHTER DOK J fiLE STROKEWORKING HEAD Fil Led May 18, 1926 5 Sheets-Sheet 2 Hum H. SCHLACHTERDOUBLE STROKE womuue HEAD July 3, 19,28.v Y 1,676,163

Fi led May 18, 1926 s Sheets-Sheet 3 July 3, 1928. 1,676,163

H. SCHLACHTER DOUBLE STROKE WORKING HEAD Filed May 18, 1926 5Sheets-Sheet 4 July 3, 1928. 1,676,163

H. SCHLACHTER DOUBLE'STROKE WORKING HEAD Filed May 18, 1926 sSheets-Sheet 5 Patented July 3, 1928.

UNITED stare I 1,676,163 FE'EC HENRY SGHLACHTER, on BEATRICE, NEBRASKA,ASSIGNOR TO nEMPsTna iviILL MAN- UFACTURING COMPANY, or BEATRICE,NEBRASKA, A conronarionornnnansxa.

noUBLE-srRoKnwoRKIne HEAD,

Application fiieq il ay is,

arrangements within the spirit and scope thereof.

yAn object of the invent on'is to provide an. improved working head foractuating severalpump rods, that will be durable, efiicient and quiet inoperation by, reason of lubrication and enclosing possibilities due tothe construction and arrangement of .20

construction and assembly. With this and other objects in view, theinvention consists in certain novel features in construction andcombination and in arrangement of parts :and features as more Ifiedhereinafter.

Referring to the accompanying drawings forminga part hereof 5 Fig. 1shows'the working head of my invention in side elevation, the top coverhood appearing in vertical section.

Fig. 2 isan end elevation, the cover hood appearing in vertical sectionI 36 Fig. 3 .is a vertical section taken inaplane at right angles to theaxis of the dr ve -Fig. 4 is a top plan, the cover hood appearing inhorizontal section. a 1 a Fig. 5 isa detail vertical section taken in aplane parallel to the axis; of the ,drive shaft. c f

Fig. 6 is a horizontal section on'the line .66,, Fig. 3 I i Fig. 7 ,'sahorizontal section on the line f77, Fig.3. Fig. 8 shows a' modifiedstructure in verticalsection. a Fig. 9 is a detail vertical section ofthe structure of Fig. 8 taken in a ,planeparallel with the drive shaft.I y t o f Fig. 10 shows the structure of Fig. Sin top plan. Y I

F g-ll Sh Sthe structure of in horiaontal section. 1

the parts, and that will be economical in fully and particularly setforth and speci-.

926. Serial no. 169,548.

IReferring to the construction of Fi gs. 1+7,

fof the drawings, the main supportingfra ne or structure (which ismounted and supported by any suitable means, not shown)- embodies astrong rigid open-top lubricant retaining gear case 1,-0n which ismount- ;ed a superstructure or elevated supporting frame, made up of apairof approxin atelysimilar castings or other strong rigidframe.members, each consisting .of a horizontal v cross bar 2, formed withend legs 2.,that diverge downwardly. "These two framemembers arearranged side by side with the lower endsof their legs 2, seated on andbolted or otherwisefclamped or fixed to the opposite side topQflangsoredges of the gear case 1.' The elevated horizontal cross bars or heads2, are parallel and-secured together in relatively fixed relation bycross bolts 2", or in any other suitable manner, and said bars 2 aresofrelatively formed or arranged as to provide'between tlrieir adjacentvertical side faces a vertical space for the passage and reciprocationof certain o aeratin'g members connected with or forminguprightextensions of the pump grods This superstructure frame consisting ofcross heads 2 and their .supporting le'gs, also supports" and providesfor anchoring a pair of spaced parallel Trigid upstanding guide rods 3,at-their lower ends clamped or otherwise fixed to the heads .2 andarranged at theouter edges thereof, "and at theiruppe'r ends .thfese]guide rods are fixed to and rigidly connected by cross head .3.-

These guide rods are braced and 3", at theirupper' ends boltedorotherwise fixed to the oppos' ite., end portions of the cross head 3 atone side thereof, and at. their lower ends bolted or otherwise fixedtothe heads 2, at corresponding endsthereof.

The rotary main drive shaftet, is carried by, extends horizontallythrough and tothe a stiffened by spaced parallel inclined sidebrace-rodsprovide two identical} geared pinions, 4 1

that are in constant driving mesh with the teeth of two relatively largevertically-rotat ing parallel identical gear wheels 5, suitably m unted:a a lergies by; and Wi h n th gear box. 'In one form of my invention,these two gears 5, are fixed to the opposite endsof a common rotaryhorizontal shaft or axis 5 This shaft 5*, is carried by and mountedin-va journal box arranged approximately centrally within the gear case andfixed thereto. This journal box consists of a pillow 6, fixed to andcentrally traversing the'upper part of a central vertical well or .curb1?, within and rising from the bottom of the gear case 1, and a cap 6 Inthe example shown, the pillow and cap have longitudinal horizontal sideflanges throu jh which bolts pass to clamp the cap to t e pillow, theside flanges being recessed or otherwise formed, to permit free verticalpassage of vertical reciprocating pump rod operating parts through thewell 1, and at opposite side of the journal box. The Well i and journalbox are arranged in the gear reciprocatory cross head slide 7, thatextends horizontally between the vertical guide rods 3'and embodiesvertical parallel end sleeves .7 confined to and slidable longitudinallyof said rods 3, and identical pitmen 8, at their upper ends pivotallyjoined to said slide to actuate the same and at their lower endseccentrically joined to the gears 5, to beactuated thereby toreciprocate said slide.

The gear wheels 5 are provided with diametrically opposite outwardlyprojecting crank pins 5 on which the lowerends of the pitmen 8 aremounted and confined.

At their upper ends the pitmen 8, are pivotally joined to the slide 7,in any suit able'manner, although the upper ends of the two pitmen 8,are preferably joined by a cross rock shaft 8 to the opposite ends ofwhich the upper ends of the pitmen are secured, and this rock shaft 8 isjournaled and confined in a bearing extending longitudinally through afront side extension 7", of the slide The pitmen are arranged beyond theends of the reciprocatory slide, and beyond opposite sides of thesuperstructure frame 2, 2 and beyond the outer side faces of the gearwheels 5, and extend into the gear case 1,;between the vertical endwalls thereof and the gear wheels 5.

And'the arrangement is such that the ver tical planes in which thepitmen operate are beyond the guide rods 3 and braces 3, so

planes. Also, the vertical plane in which the guide rods 3, are arrangedis to one side of the vertical plane in which the axisb of the gearwheels 5, and the axis 8, coupling the pitmen 8, are arranged, The frontside extension 7", of the slide 7, is preferably so arranged as tolocate the rock shaft 8*, parallel with and in the same vertical planeas the axis 5*, of gear wheels 5.,

In the particular example shown, two parallel depending oppositelyreciprocating pump rods 9, 10, appear, the rod 10, being tubular, withthe other'rod 9, extending therethrough and working therein.

To the upper end of tubularsrod 10, is fixed a horizontal cross head10", below the gear case 1, and a pair of spaced parallel vertical pumprod extensions 10, are-fixed toand rise from the cross head 10*,-and,'at

points a distance above the gear case 1, are provided with straightparallel'geared' racks 10, in upward continuation of the rods 10, andfixedly secured thereto. 7

The center rod 9, is provided with a vertical double rack 9 rigidtherewith and forming a longitudinally alined upward ex tension thereof,and located midway between the two racks 10 The center double rack 9,can be coupled to rod 9, in any suitable manner or by any suitablemeans, although I show a yoke connection between the rod and rack toavoid the journal box 6, 6, that carries the shaft of gear wheels 5, bystraddling the same. This yoke connection embodies a cross head 9",fixed to the-rod 9, and located below the journal box, across head 9,above the journal box and rigid with the lower end of double rack 9, andspaced vertical stiff tie rods 9, arranged beyond opposite sides of thejournal box and secured to and connecting ends of the cross heads 9, 9to form a stiif push and pull connection between rod 9 and rack 9t Thestraight rack 9?, is secured at its upper end. to the 'recipro catorycross head 7,

preferably by screw threaded connection be tween the reduced threadedupper end of the rack and threaded nipple 7 depending from and rigidwith the front extension 7*, of the crosshead and located midway betweenthe pitmen 8 and in the vertical plane of the shafts 8 5 Y Operativedriving connection is established in any suitable manner between therack 9 and the racks 10 of thepump rod extensions 10 For instance, Ishow the double rack 9 arranged between and in constant driving meshwith a pairv of pinions 11, which are also in constant driving mesh withthe single racks 10", respectively. By this arrangement, upward movementof double rack 9*, will, through the medium of rotary pinions 11, causecorresponding downward movement of both racks 10 and down- JUN ' rods 9,-10.

ward 'inoi eme'nt of rack 9, Will cause upard movement of racks 10, andhence simultaneous Opposite reciprocation of pump The operating andcontrolling. connections of the pump rods 9, 10,*BXtel1'Cl upwardlythrough the gear case between the large gears 5 and-at opposite sides ofthe journal box, 6, 6 and upwardly from the gearbox through the verticalspace betweenthe frame su'perstructure parts 2, 2-, to points above thesame. The floor orbotto'm'o'fthe gear case pro-' vides 'a horizontallyelongated narrow (vertical opening for the free passage'of saidconnections The gear case is cast or otherwise formed with theinternal'r-annular upstanding flange oryvell curb 1, surrounding saidopening and rising therefrom to' carry the journal box 6, 6, and toenable the gear case to receive and'retain, at-least tothelevel of thetopedg'e of said Well orcurb, a large or deep body of lubricant.-Suitable supporting and mounting meansfor the pinions' 11, pro'-jviding'con'fining guides for the racks 9 10,

are mounted on the superstructure frame memb'ers 2,'2. j For 1nstance,lIshow'a pair of parallel spaced horizontal bars, such as angle bars 12,arranged on and longitudinallyot and bolted tothe frame members 2," withthe pinions arranged between the, adjoining vertical faces ot-said barsand rotatable on and ca-rriedby short horizontal parallel shafts orspindles 13 carried by-and extending trans v'ersely through saidbars."The-inner vertical'faces ofthe bars serve to guide 'and I confine theracks.

The bars"12,"canalsocarry suitable means to, bear againstthe smoothouter longitudinal edge portions 'O'fracksIjO to maintain the gearing ofsaid "racks in' constant mesh withpinions 11. For instance,"l "showVertically arranged-guide or bearing blocks or shoes 14,adjustablyarranged ja nd supported be-' tween the o'uter en'dsof thebars and bearing against theouter longitudinal 'edges or said racks.Thesei'shoes 14 are normally clamped to the bars b'y bolts,"bu't can beloosened and adjusted to takefu'p Wearor for other'reasons by adjustablestop bolts 14 In practica th'eu sual'cover, preferablyan open-bottomupstanding removable" sheet metal hood 15, 'is employed to rise from.the "gear case and cover the open' top thereof and enclose alloftli'e-fix'ed and Working parts rising from'or extending above the gearcase, and thereby p rot'e'ct the samefandthe interior ofthe gear casefrom dirt and the Weather and to'preve'nt escape of lubricant. This hoodis preferably oii 'o'r lubricant tight, and at 1 its annular lower edgefits on and is s'ecuredt'o the anist.

niilar top edge ;or flange of the, gear case 1 preferably to fform falubricantjtight the structure of Figs-.14 1

"The racks- 1811 9 extend up through a In operation, rotation ofv-thedrive shaft 4:, causes simultaneous rotation of the two large crank"wheels 5-, which operateias one gear, and through-- the I medium of thetwo pitmen' W 8, 'w hioh 'operate as one,

the cross" head "slide': 7-, is nrecipro'cate'd longitudinally of rodsThe re-ck 9, se-

16, and the open bottomsection 17 the annula'r edges ofsaidrsectioiiaaround; said open top and bottom meeting, and thesecpreferably liquid tight: joint; 2

tions are there boltecttogether to" form a.

i The bottom of the lubricant retaining gear case is formed with :avertical openingfor the passage of the pump 1 rods 1 8,- '19, a and thisopening is surrounded-by an annular flange or Well curb 20, risingWithin the gear 7 case to'lretain the' lubr-icanttherei-nwu "The twopumprods 19 are connected toe gether to operate as one, and usually formedupward extensions of a tubular rod through which the center pump rod 18extends: double rack 18 formsa rigid upward longitudinal, continuationor pump'rod =18, and thi rack is hung from and at its up'perend securedii to :a lateral projection: 01' extension of vertically recipr ocatorycrosshead' slide 21, confined-to and yertically' slidable on the fiXed-gUide rOds-QZ These rods"22 fare secured to and irise from the gear caseandare secured together .ati their upper t'ifiened by 'brace rods 23;

ends

' "The tWlIi- 'pu'm f rod extensionsi9 are resided With's'i'ngle racks19 ,"-for:ming -up- Ward -'extension-slothereof, and these =rack's I areheld by backing rollers 2 1, in constant driving mesh ;with" spur "gearpinions 215, theta-re also in constant-operative mesh with the doublerackl8, so that'the operation-isas hereinbefore described With respectto vertical opening in the top ot -the gear'case; i I andthereftrombetween a pa ir ot parallel spaced bars'26-"; securel. on the' top'ofthef-mo Q gear case and bridging sa aopening. The rolls-24,- andplnions 25, are" arranged; be-

tween these bars and are carried by spindles "3 65 xtending'transversely through the pairs;- 1 1 The-twin] reoiprocatiiig pitmen27', that reciprocateslide 21, extend fromt-he gear or crank whee1s28-in the-"lower section of the gear case, upwardly through the opening inthe gear-case top, to the side extension of the slide, and are securedto the opposite ends of a rock shaft 29, mounted and journaledinsaid-extension The'large vertical twin gears or-crankwheels 28,operate as one wheel, although arranged at opposite sides or ends of thegear case interior, and independently 'mounted on separate alinedconcentric trunions 30, carried by and projecting inwardly from theopposite end walls of the lower section 16, of the gear case. Thetwincrank wheels 28, are simultaneously driven in the same direction by twinpinions 31, on a common rotary drive shaft 31 extending across theinterior of the gear I case and extending to the exterior thereofand'mounted in bearings carried by the walls ofgear casesection 16. r

The pitmenv 27, extend down through the interior of the gear case.between the crank wheels 28, I and beyond opposite sides ofv the pumprods, racks, and well 20, andat their lower endsrhave crank pinconnection with said wheels 28, so-that the operation is. ashereinbefore explained with respect to the structurefirst described. a

In a practice, the usual lubricant-tight sheet metal hood,.not shown, isplaced over the fixed and working parts that extend above the gear case,andis removably secured on the gear case to cover the top economy,dependability,

' means. 6

thereof :and .form a lubricant tight joint therewith and a lubricantcover.

The constructions described are rugged in structure and exceedinglydurable, and are simple to construct and assemble and pro-r vide forlong-time self lubrication and enclosure to prevent lubricant waste andto exclude the weather and dust and dirt.

'Materialadvantages in the matters of durability, loW production andupkeep costs, and efficiency in operation are attained, with theadvantages'of a weatherproof lubricant tight encasement, and theadvantageous cooperation of crank and pinion drive for oppositelyreciprocatory pump rods, with crank wheel, pitman and reciprocatoryslide actuating It is evident that various changes, modifications, andvariations might be resorted to without departing from= the spirit, and

' scope ofthe invention'and hence I do, not

wish to limit the inventionto the approximately exact disclosures hereof1 -What I claim is;

'1. In ;combination, .in' a double stroke working head, pump rods, asupporting gear case, a twin crank wheels mounted in said case, anelevated vertically reciprocatory- Y cross head,itwin pitmen forreciprocating said elevated cross head from said wheels, and rack andpinion means connecting the pumpjrodsfor simultaneously and oppositelyreciprocating-the pump rods, said rack and tory pump rods provided withracks in upward longitudinal continuation thereof and with meansconnecting said racks to cause simultaneous opposite reciprocationthereof and the pump rods depending therefrom, a gear case into whichsaid rods extend and from which said racksextend upwardly, a verticallyreciprocatory slide arranged above said gear case and coupled to theupper end of one of said racks to vertically reciprocate the same, acrank wheel mounted in. said gear case, and apitman operatively coupledthereto andextending upwardly from said gear case and operativelycoupled to said slide.

3. In combination, a supporting gear case, a fixed vertical slidewayrising from said case and carried thereby, a vertically reciprocatoryslide above said gear case and confined to said slideway, a verticallyreciprocatory pump rod at its upper end coupled to said slide anddepending through said gear case and vertically reciprocated by saidslide, another vertical reciprocatory pump rod depending through saidgear case, op erating connections from said first mentioned rod to saidsecond mentioned rod to simultaneously and'oppositely reciprocate thesecond rod from the first rod, and eccentric means for reciprocatingsaid slide, arranged within the gear case and extending upwardlytherefrom tosaid slide and operatively coupled thereto. 7 V

4. A working head for' actuating oppositely reciprocatory pump pistons,comprising a gear case, a drive shaft therein, twin crank Wheels thereindriven by said shaft, vertical reciprocatory pump rods extending throughsaid case from a point below to a point above said case andarrangedbetween ing a gear case, vertical guide rods fixed to said caseand rising therefrom, a vertically reciprocatory slide above said gearcase and confined to said rods, oppositely reciprocatory pump rodsextending downwardly through said case, one of said rods having itsupper end directly coupled to said slide, the upper portions of saidrods having longitudinal racks extending above said case and gearedtogether to cause simultaneous connection with said slide above the caseto opposite reciprocation, and rotary driving means wltlnn said case andhaving operatlve bysaid frame and in mesh with said pin- 1 ions, side;pump,.rods extending through said v case and having racks forming theupper" parts thereof and in mesh with said pinions 'andguided by saidframe, a verticallyreciprocatory slide arranged abovefsaid gear case andrframe and directly coupled to the upper end of one cat said rods toreciprocate thesame and the other rods, and rotary oper- 'atlng meansarranged within the gear case -1 "said slide to reciprocate the same.

having eccentricoperating connection with -.7. In combination, a gearcase',-tw1n crank wheels therein, a drive shaft, therefor, a ver ticalslidewayfixedto said case, a vertically reciprocatory slide confined todsaidisl'ideway;

pitmen from said WllGBlSj ilO said. slide to reciprocateflthe same,center vertical pump rod coupled-to said; slide andvertical-ly ;rej-

ci'procated thereby, another vertical pun p rod, ;and rack and piniongearing connecting said pump rodsto simultaneously and oppositelyreciprocate the secondrod-irom the first rod. v .[;8., In combination, agear case, vertrca'l fixed .g'ui'de rodscarrled by-sa d case, a vers'ticall-y reciprocatory cross head slide confined to saidrods and formedwith atra'ns-' verse, tubular bearing, a transverse rock shaft. in saidbearing, crank fW-heels in said case, pitmen actuated byrsaidcrank-Wheels and extending upwardly and attheir upper ends coupled tosaidw-shaitfto reciprocate said slide, oppositely reciprocatoryupumprods, and P,lnl0ll,,11fld qrack transmission means operatively.connecting saidrods to cause simultaneous and opposite reciprocation,one of said-rods being directly coupled"- tos'a'id-slid'e andreciprocated-thereby.

,9. A- working "head for rmulti-pisto'n" pumps,;;comp ri'sing, incombination, a sup portinggear case having .a top opening and a bottom ropenin'g, several reciproca-tory pump rods extending down through-. said'case'fronia point above the same to a: point below the same, a powertIfi-DSIIll-SSIOHDPGP- ativelyconnecting said rods abovesaid case tocause simultaneous opposite reciprocation thereof, a rotary drive: shaftwithin said case, a rotarymember within said'lcasef'and driven by saidshaft,*and operative connections actuatedbyvsaid member for reciproscatingsaid rods and coupled to the upper end'of one of said-rods abovesaid case and embodying gu ding-means. above a'ndrcarrled by the caseand a pitman. extending upwardly from said me m'ber, to a point above;

said case.

10. A working punrps, comprisiilgg-iir combination, a supporting-encase;ment arranged to contain lubricant,f a-drive shaft, a rotarymember driven/thereby, several reciprocatory pump rods, operativeconnections -between said rods to reciprocate-saute simultaneouslyiny0p. posited-lrections, suitable crank and 'rec1-p-- headn1ulti-piston I rocating cross head connections-between one I I of saidrods and said member :to reciprocate I said rod and arranged'ztoiconvert rotary motion into reciprocatory movement and means forretaining said-rodin vertical alinemen-t during reciprocation, saidconnections' beingin part located exteriorlyofand above said encasement;Y

'l lyA working head for? driven thereby, several tr'eciproc'atory pump 7rods, said encasement providing a vertically open well -forthepassageof. said rods sun rounded-by 4a lubricantexcluding curb operati-veconnections between said rods-to -rec1procate' same simultaneouslyin opposite directions, suitable connections between one of said rodsand said" member arranged to soonvert rotary JTISOfilOIhlIl-EOreciprocatorysmove ment and means for retaining said rod in verticalalinementuduring' reciprocation.

:l2. A Working head for ,multi-piston pumps, comprising in-:combina'tion,-a support ng encasement arranged .to contain 'lubrlcant,a "drive shaft, a: rotary member mu-lti-piston pumps, comprising incombination a sup-. porting encasement arranged @to (contain I'lubricanha. drive shaft, a, rotar'yi member driven thereby,several.reciprmatory pump,

rods wwith suitable intervening;connecting gear mechan sm .to causetheir simultaneous o osite reci rocation under the o eratin' 2'3power-of one ofthe /ro ds-,xoperative connec-.

'tions between one of said rods andsaid member jto-reciprocate said rod.andguiding means .for sa d connect-ions, said 'COHIIGCtlOIlS extending,aupvvardly from "said-imember to said rod and arranged to-"convert' rotary motion 'intorecipro c'atory movement. I

7:13..In combination, alubricant contain- 7 ing encasement, a' fixedframe above 'said' encasement with pinions mounted-therein, a'

center pump rod exten'ding tlirough 'said encasement and having a doublerack torming theupper part th'ereofand guided by said" frame and in meshwith said pinion's,

side pump rods extending through. said case and having racks forming theupper parts thereof, andin mesh-with ,saicl-pinions1a'nd guided by said;frame, averticalIy'recipro- 'c'atory slide arranged above said gear caseand frame and directly 'c'oupledto the upper end ofone of said rodst'oreciprocate the I same and the other rods', rotary operating 'meansarranged' within the encasement having eccentric operating connectionextending upto'said slide to reciprocate the same;

and a weatherproof, oil retaining hood to cover said mechanism andencasement.

14-. A pump Working head comprising several vertically reciprocatoryrods connected'together to simultaneously reciprocate in oppositedirections, in combination with a vertically 'rcciprocatory slideoperatively connected to said rods to drive the same, a rotary" drivingmember operatively connected to said slide to reciprocate the same, asupporting-base for sai'dheadembodying a lubricant retaining gear casein which said rotarymember is mounted to travel in the lubricant, saidcase having a well extending vertically therethrough and formed by avertical lubricant retaining curb, said case beingopenat the top, anopen' frame fixed to and rising-from said case to a point-above its opentop, said rods extending into saidframe and through said case and thewell therein, a vertical slide way carried by said frame, said slidebeing confined tosaid-slideway and elevated above said casingy-and aremovablehood open at its bottom and covering and rising from said vcaseand enclosing said frame,-slideway,

slide and other parts abovesaid case.-

15. A pump workinghead comprising a vertically reciprocatoryslide, afixedvertical slideway therefor, a rotary driving member, andeccentricdriving connection therefrom to said slide to reciprocate thesame, in combination fwith several fvertically reciprocatory uprightrods, gearing connectin said rods to cause opposite reciprocationthereof, at leastione of said rods coupled to said slide for driving therods, agear case'forming a lubricant receptacle and having-an open topthrough which the operating parts within the case are accessiblegsaidrotary driving member being arranged within the case-to operate in thelubricant't-herein, said rods extending through the case from below toabove the same, said slideway beingiarra'nged above theopen top of thecase with said'shde confined to said slideway, and a removable coverhood rising from the case and covering its open top and enclosing andprotecting said rods,,the slideway, theslide and other parts above saidcase. i

16. A working head for a-pump comprising a gear case having a wellopening through the bottom thereof and formed W *ith a vertical annularcurb, whereby the case forms a lubricant receptacle, a rotary drivingmember mounted in said case .to work in the lubricant, fixed slide rodscarried by and arranged above said case, a' vertically reciprocatorycross head slide above the case and confined to said slide rods, a slideactuating pitman extending from said rotary member upwardly to saidslide, several'vertically :re-

ciprocatory rods extending through said case rev-area on said case andprotecting and enclosing all of said parts above the case. 7

l7. Ina pump working head, incombination, a supporting base embodying agear case havingan open bottom well surrounded by anannularvertical'curb'whereby the case forms a: lubricant retaining receptacle,twin cranlrWheels in said case besidesaidowell to work in the'lubricant,a drive shaft in the ease for said wheels, a vertically-reciprocatoryslide and its guiding means above said case, twin pitmen extending fromsaid slide downwardly into said case exteriorlyof said well and actuatedby said wheels, several reciprocatory pump rods extending upwardlythrough said well and the case to a point above the case and driven bysaid slide, and means abovethc case operatively connecting said rods toreciprocate in unison in opposite directions.

18.-- In a pump working head,- in tion, a supporting gear case open atthe top and forming a lubricant retaining receptacle, whereby operating,parts Withinthe case are accessible through its opentop,- a removableweather excluding lubricant-retaining hood rising from and carried bysaid case and forming a top cover therefor, said-hood open at its bottomand fitting'the top of the case around its open top,several'reciprocatory rods extending upwardly through said'case frombelow and into said ho0d,;and means for driving said rods in unison inopposite directions said" means protected'by said hood, andacce'ssibleywhen the hoodis removed, and comprising arotary drivingmember in" said j'case, a reciprocatory slide, and operating connectionfrom the member to the slide, said hood being vertically removable fromand applicable to said case asaunit.

19. In a pump working head, in combina, tion, a supporting gearcaseforming a'lubricant retaining receptacle and having an in-; ternal' opentop and bottom well surrounded by an annular vertical curb,'risingi-i'n-said receptacle to an elevation above the lubricant level,a transverse journal box carried by said curb, a shaft mounted in saidbox and at its ends provided with crank wheels at the exterior of saidwell to work inthe lubricant in said case, a vertical slideway carriedby the case and arranged above the same, a vertically reciprocatoryslide confined to said slideway, twin pitmen for actuating said slideand extending down into tending upwardly through said Well and the caseand operatively coupled .to said annular vertical curb, a transversejournal box carried by said curb, a shaft mounted 'in said box and atits ends provided With crank 'wheels at the exterior of said Well tovwork in the lubricant in said case, a'vertical I day of May, 1926.

slideway carried by the case and arranged above the same, a vertically,reciprocatory slide confinedto said slideway, twin pitnien for-actuatingsaid slide and extending down into said case at the outer sides of saidWheels and actuated thereby, and several simultaneously oppositelyreciprocatory pump rods extending through said. Well and the case,

of said rods being ofiset around said box and coupled to said slide,means being provided to cause said rods when driven by said slide toreciprocate in unisonin opposite directions. Y I

V Signed at Beatrice, Nebraska,

HENRY SCHLAOHTER.

at opposite sides of said journal box, one" this 13th

